[qwiz style=”width: 650px !important; min-height: 400px !important;” qrecord_id=”sciencemusicvideosMeister1961-Allopatric speciation (Int. Read., HS)”]

[h] Speciation Interactive Reading

[q] Until about 2.8 million years ago, there was a gap between the southern tip of North America and the northern tip of South America. This gap allowed water to flow from the Pacific Ocean to the Atlantic Ocean, and vice versa. But then, the movement of the continents created a land bridge between the two continents: the Isthmus of Panama (shown below).

[q] Today, two closely related species of shrimp are found on each side of the Isthmus. One is on the Atlantic side, and one is on the Pacific side. Under natural conditions, they have no contact. But when they’re experimentally brought together, these two species don’t interbreed. Instead, they aggressively snap their claws at one another. (source: Biology, Starr, Taggart, Evers, Starr, 14th ed.)

In your student learning guide, use what you’ve learned about species, reproductive barriers, natural selection, and population genetics, to write a short explanation of what’s going on. This is just a preliminary idea, so speculate!

Click “Continue” when you’re ready.

[q]

The image on the left shows a model for explaining what you encountered on the previous card. It’s called allopatric speciation.  The “allo” prefix means “other” or “another.” The “patric” stem means “country” (a stem that also appears in words like patriotic).

Take a moment and see if you can think through an explanation of what happened in the isthmus of Panama, using this model. Go ahead and give it a try, preferably by talking it through with a partner (or even saying it out loud to yourself). Click “Continue” when you’re ready.

 

[q] Here’s the same image that started this interactive reading. If you’re understanding allopatric speciation, you should be able to write a short paragraph explaining the speciation of shrimp that followed the formation of the isthmus of Panama. Give it a try, and then compare your answer to mine.

[c]IFNob3cgdGhl IGFuc3dlcg==[Qq]

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[qwiz summary=”true” qrecord_id=”sciencemusicvideosMeister1961-Hybrid Zones (HS)”]

[h] Understanding Hybrid Zones
[i]

[q] Hybrid Zone: Swallowtail Butterflies

[q] Hybrid Zone: Redstarts, South America

[q] Hybrid Zone: European Crows and Magpies

[q] In the series of diagrams below, which number shows a hybrid zone?

[textentry single_char=”true”]

 

[c]ID M=[Qq]

[f]IE5pY2UhICYjODIyMDszJiM4MjIxOyBzaG93cyBhIGh5YnJpZCB6b25lLg==[Qq]

[c]IEVudGVyIHdvcmQ=[Qq]

[c]ICo=[Qq]

[f]IE5vLiBIZXJlJiM4MjE3O3MgYSBoaW50LiBMb29rIGZvciB0aGUgbnVtYmVyIHdoZXJlIHR3byBkaXN0aW5jdCBzcGVjaWVzIGFyZSByZXByZXNlbnRlZCAodGhyb3VnaCB0d28gZGlzdGluY3QgY29sb3JzKS4gQnV0IHRoZXJlIGFsc28gbmVlZHMgdG8gYmUgYSB6b25lIHdoZXJlIHRoZSB0d28gYmxlbmQgdG9nZXRoZXIu[Qq]

[q] In the series of diagrams below, number 4 shows complete [hangman]. In number 3, there’s a [hangman] zone in which limited [hangman] flow can occur between the species represented by the blue and green colors.

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[c]Z2VuZQ==[Qq]

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[qwiz qrecord_id=”sciencemusicvideosMeister1961-Ring Species (Int. Read., HS)”]

[h]Ring Species: interactive reading

[i]

[q]

Ensatina eschscholtzii is species of salamander whose range extends from Baja California (in Mexico) up to British Columbia (in Canada). Across its geographic range, E. eschscholtzii has diversified into several subspecies (numbered 1 through 7). While each subspecies can interbreed with the neighboring population (subspecies 1 can breed with 2, 2 with 3, and so on, no interbreeding is possible between subspecies 1 and subspecies 7.

Note that the one place where Ensatina salamanders can’t live is in California’s Central Valley, which is much hotter and drier than either the California coast ranges, the Sierra Nevada mountains, or the mountains of Oregon, Washington, and British Columbia.

Based on what you know about speciation, see if you can explain what’s going on. Click Continuee” when you’re ready.

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[qwiz qrecord_id=”sciencemusicvideosMeister1961-Allopatric Speciation Checking Understanding (HS)”] [h]

Allopatric Speciation: Checking Understanding

[i]

 

[q] Speciation that involves a geographical barrier is called [hangman] speciation.

[c]IGFsbG9wYXRyaWM=[Qq]

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[q] In the diagram below, which phase shows when a geographic barrier first subdivides a population into two isolated gene pool?. 

[textentry single_char=”true”]

[c]ID I=[Qq]

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[c]IEVudGVyIHdvcmQ=[Qq]

[c]ICo=[Qq]

[f]IE5vLiBKdXN0IGxvb2sgZm9yIHRoZSBlYXJsaWVzdCBtb21lbnQgaW4gdGhpcyBzZXF1ZW5jZSB3aGVuIGFsbGVsZXMgd291bGQgbm8gbG9uZ2VyIGJlIGFibGUgdG8gZmxvdyBmcm9tIHRoZSBsZWZ0IHNpZGUgb2YgdGhlIGNpcmNsZSB0byB0aGUgcmlnaHQgc2lkZS4=[Qq]

[q]In the diagram below, which letter or number represents gene flow?

[textentry single_char=”true”]

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[f]IE5pY2Ugam9iLiBMZXR0ZXIgJiM4MjIwO2EmIzgyMjE7IHJlcHJlc2VudHMgZ2VuZSBmbG93Lg==[Qq]

[c]IEVudGVyIHdvcmQ=[Qq]

[c]ICo=[Qq]

[f]IE5vLiBHZW5lIGZsb3cgaXMgYSBwcm9jZXNzIHRoYXQgbW92ZXMgYWxsZWxlcyBiZXR3ZWVuIHBvcHVsYXRpb25zLCBwcmV2ZW50aW5nIGRpZmZlcmVudGlhdGlvbi4=[Qq]

[q]By stage 4, the two species can no longer [hangman] \.

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[q]The basic idea of allopatric speciation is that ______________ isolation leads to genetic differentiation, which leads to reproductive isolation.

[hangman ]

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[q]The basic idea of allopatric speciation is that geographical isolation leads to genetic differentiation, which leads to ___________ isolation.

[hangman ]

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[q]A [hangman] is a gradual shift in genetic variation that occurs along a geographical axis.

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[q]A cline is a gradual shift in genetic [hangman ] that occurs along a geographical axis.

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[q]Number 3 below represents a [hangman] zone.

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[q]In the speciation model below, the gradual shift between green and blue in diagram 2 is called a [hangman].

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[q]The complex of E. eschscholtzii subspecies shown belo  is called a [hangman] species.

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[q]A key characteristic of the E. eschscholtzii subspecies complex shown below is the inability of subspecies 1 and subspecies 7 to [hangman].

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[q]In the E. eschscholtzii ring species complex shown below, if it weren’t for the gene flow between all of the adjacent subspecies, you could almost think of subspecies 1 and 7 as separate [hangman].

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[q]In the diagram below, which letter represents a geographical barrier

[textentry single_char=”true”]

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[c]IEVudGVyIHdvcmQ=[Qq]

[c]ICo=[Qq]

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[q]In the diagram below, which letter represents the moment in which mutations start to emerge in the gene pools of each subpopulation?

[textentry single_char=”true”]

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[c]IEVudGVyIHdvcmQ=[Qq]

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[q]If the environments experienced by the populations on the left and right sides are different, then another force causing the populations to genetically differentiate would be [hangman] [hangman].

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[q]In the diagram below, which letter represents the moment in which the two new species have become reproductively isolated?

[textentry single_char=”true”]

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[f]IFRlcnJpZmljLiBMZXR0ZXIgJiM4MjIwO0YmIzgyMjE7IHJlcHJlc2VudHMgdGhlIG1vbWVudCB3aGVuIHRoZSB0d28gcG9wdWxhdGlvbnMgYXJlIGJhY2sgaW4gY29udGFjdCwgYnV0IG5vIGxvbmdlciBpbnRlcmJyZWVkLiBUaGF0IG1lYW5zIHRoZXkmIzgyMTc7dmUgYmVjb21lIHJlcHJvZHVjdGl2ZWx5IGlzb2xhdGVkLg==[Qq]

[c]IEVudGVyIHdvcmQ=[Qq]

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[x][restart]

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